滇东曲靖地区下寒武统筇竹寺组泥页岩储层特征研究

下寒武统筇竹寺组页岩是南方页岩气勘查开发重点关注的层位之一,但滇东地区下寒武统筇竹寺组黑色页岩储层研究程度较低。样品采自2014年新钻的曲页1井,对下寒武统筇竹寺组黑色泥页岩进行全岩和粘土矿物X衍射分析、TOC、岩石物性、比表面积等测试和扫描电镜实验,综合分析了滇东曲靖地区筇竹寺组泥页岩储层特征及孔隙类型。结果表明:滇东曲靖地区下寒武统筇竹寺组泥页岩矿物组成主要是石英(44.75%)、粘土矿物(25.47%)、长石(16.44%);发育粒间孔、粒内孔和有机孔3种类型孔隙;有机质孔隙发育,以中孔为主,具有一定的页岩气勘探开发潜力;页岩储层自上而下孔隙体积有逐渐变小的趋势,但在井深400 m~500 m发育高孔隙体积;泥页岩储集性能的重要指标——孔隙度主要受有机质含量及发育程度的制约。

THE CHARACTERISTICS OF SHALE RESERVOIR FROM QIONGZHUSI FORMATION IN LOWER CAMBRIAN IN QUJING AREA, EASTERN YUNNAN PROVINCE, CHINA:A CASE STUDY OF WELL QUYE NO.1

Shale from Qiongzhusi formation in Lower Cambrian is one of the most important focuses in shale gas exploration and development in South China; however, the black shale reservoir from Qiongzhusi formation in Lower Cambrian in eastern Yunnan province stays in a low level of study. Take Well Quye No.1 drilled in 2014 as an example, on the black shales from Qiongzhusi formation in Lower Cambrian, X-ray diffraction analysis of the whole rock and clay minerals are made; tests and SEM experiments like TOC,physical property and specific surface area are conducted; the characteristics and types of shale reservoir are analyzed comprehensively. The results show that shales are mainly composed of quartz (44.75%), clay minerals(25.47%)and feldspar (16.44%), consisting of three major pore types, which are intergranular pore, intragranular pore and organic-matter pore. It is worth mentioning that organic-matter pores are abundant and of great importance, in which mesopores are the main force with a certain potential of shale gas exploration and development. The volumes of pores decrease with the depth, and with increasing TOC, micropore volumes relatively increase. The porosity is mainly restricted by the organic-matter content and the development degree.